Intel 80287, 80286 manual Zero, U U2

OVERVIEW OF NUMERIC PROCESSING

Table 1-14. Packed Decimal Encodings

						Magnitude
	Class	. Sign			I digit	I digit	I digit	I ... I
				digit					digit
	(Largest)	0	0000000	1 0 0 1	1 0 0 1	1 0 0 1	1 o 0 1	· ..	1 0 0 1
GI		·	·				·
~		·	·				·
III		0·	·				o 0 0·0
.iJj				o 0 0 0	o 0 0 0	o 0 0 0		· ..	o 0 0 1
0 (Smallest)			0000000
11.
	Zero	0	0000000	000 0	o 0 0 0	o 0 0 0	o 0 0 0	...	o 0 0 0
	Zero	1	0000000	o 000	o 0 0 0	o 0 0 0	o 0 0 0	...	o 0 0 0
III				o 0 0 0		o 0 0 0	o 0 0 0	·..	o 0 0 1
GI					/
.::	(Smallest)	1	0000000
GI					o 0 0 0
		·	·				·
10		·	·				·
z
Dl		1· 0000000·					1 001·
	(Largest)			1 o 0 1	1 o 0 1	1 0 0 1			1 0 0 1
	Indefinite'	1	1111111	1 1 1 1	1 1 1 1	U U U U2	U U U U		U U U U

1'-1byte--.I......t----------9 bytes --------- l...1

NOTES:

1.The packed decimal indefinite encoding is stored by FBSTP in response to a masked invalid operation exception. Attempting to load this value via FBLD produces an undefined result.

2.UUUU means bit values are undefined and may contain any value.

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